Valken Nimh Smart Charger

[qogulibi]

 hi, I recently changed my tamiya mini connectors on my AEG and two NiMH batteries,

the charger states that solid red indicates charging.

when I plug the batteries into the charger they flash red, so the battery connection is mini tamiya going through to a deans adapter then onto the deans connection on the batteries..

I followed a pretty solid guide on how to convert these ie don't cut both wires together etc. Both batteries worked fine after converting them as they still had charge.

one is completely flat now therefore I come to charge and I'm getting nothing but flashing red.

when I plug another completely different battery in with a mini tamiya connection on it it charges perfectly.

I've also voltage tested both batteries and they have around 8-9v in them.

anyone have ideas as to why my deans connection batteries won't charge ?

thanks